You are looking for the Thickness probe instead. The line profile is really meant for display only and will report different 'lengths' based on the view settings ... that's not something you want. The thickness probe can also take the average width of a couple probes to ensure that the precision of the width is subpixel.

If you are not sure how to use that module send us the original image that you are processing (your hand drawn graphics are getting in the way) and we can help further.

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The RoboRealm application was created back in 2006 to take advantage of (1) lower cost generic
computing (i.e. PCs), (2) a widening range of lower cost imaging devices, (3) an increasing need
and usage of vision as primary sensor device and (4) the desire to quickly research custom solutions
using an interactive user interface with minimal programming.